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[Bug tree-optimization/19097] [4.1/4.2/4.3 regression] Quadratic behavior with many sets for the same register in VRP
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 11 Nov 2007 12:16:51 -0000
- Subject: [Bug tree-optimization/19097] [4.1/4.2/4.3 regression] Quadratic behavior with many sets for the same register in VRP
- References: <bug-19097-7737@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #46 from rguenth at gcc dot gnu dot org 2007-11-11 12:16 -------
Note that on the mainline equiv processing can be completely turned off by
just tweaking add_equivalence () to do nothing.
There are a few missed optimizations if you do that, but I belive the important
kind of things there should be done in a separate pass (or DOM, which at least
in the past could do these).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19097